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When copying DrawQuad to a RenderPass, the SharedQuadState should
already be on that RenderPass. Do not take SharedQuadState* as input
parameter for copying DrawQuad, use the last SharedQuadState on the
RenderPass instead. This not only avoids invalid SharedQuadState* being
passed in, but also reinforce that SharedQuadState and DrawQuad are
appended in order so it satisifies assumption for future implementation
of iterator after SharedQuadState id.

R=danakj@chromium.org

Bug: 739429
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I63fc2ca7a250fb8f6f9056473e0c6ab046652018
Reviewed-on: https://chromium-review.googlesource.com/597228Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491509}